Henry Wadsworth Longfellow

Some day, some day,
O troubled breast,
Shalt thou find rest.

If Love in thee
To grief give birth,
Six feet on earth
Can more than he;
There calm and free
And unoppressed
Shalt thou find rest.

The unattained 
In life at last,
When life is passed,
Shall all be gained;
And no more pained,
No more distressed,
Shalt thou find rest.